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Weather compensation- why you should use it

 
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Air Source Heat Pumps (ASHPs)
Last Post by cathodeRay 10 months ago
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 5573
07/01/2026 10:46 am  

Posted by: @jamesh
↑

Interesting thanks. I do wish the vaillant app would let me build my own weather curve. There is a lot of scope for improved user functionality - though I respect they don't want plebs messing with stuff

I agree.  I have been advising another user with a Hitachi heat pump and that does have the ability to program more complex wc curves.

Given how the Vaillant WC curve is presented in the app it wouldn't be that difficult to add the functionality.  It's interesting that the WC curve is a user level function in the app but installer level on the sensocomfort. 

Another feature about the 2-7 temperature range is that it tends to correspond to high humidity.  I for one find that the temperature needs to be half a degree warmer to be comfortable when humidity is high compared to when its low.

Despite all of this my heat pump is still much more comfortable than my boiler system was!

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Toodles
 Toodles
(@toodles)
Famed Member Contributor
Joined: 4 years ago
Posts: 3031
07/01/2026 2:46 pm  

@jamespa We have come a long way since a human lit a fire in the cave entrance to keep warm and fend of foe!😉 Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
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Joined: 5 years ago
Posts: 2190
07/01/2026 4:08 pm  

Posted by: @toodles
↑

@jamespa We have come a long way since a human lit a fire in the cave entrance to keep warm and fend of foe!😉 Toodles.

Whilst I'm sitting looking at my woodburning stove, @toodles, I'm not quite so sure....

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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Toodles
 Toodles
(@toodles)
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Joined: 4 years ago
Posts: 3031
07/01/2026 4:19 pm  

@majordennisbloodnok Well, I suppose there are still a fair number of fossils about (not you, of course!) Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 2 years ago
Posts: 1211
07/01/2026 5:01 pm  

Posted by: @toodles
↑

@jamespa We have come a long way since a human lit a fire in the cave entrance to keep warm and fend of foe!😉 Toodles.

My memories do not go back to that 🙂 But at some point I may get a real fireplace, nothing beats that feeling. 

On the other side of the spectrum, a heat battery is very attractive.  😀 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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cathodeRay
 cathodeRay
(@cathoderay)
Famed Member Moderator
Joined: 5 years ago
Posts: 3099
07/01/2026 5:09 pm  

Posted by: @batpred
↑

But at some point I may get a real fireplace, nothing beats that feeling...

...of a red face and cold ankles, as someone, not me, once said. I have a live open fireplace, and wouldn't be without it. 


Midea 14kW (for now...) ASHP heating both building and DHW


   
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Toodles
 Toodles
(@toodles)
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Joined: 4 years ago
Posts: 3031
07/01/2026 5:22 pm  

@batpred Yes, a heat battery (such as the one I use for DHW) is far superior to the system I grew up with in a council house; we had to burn coal even in mid-summer so that the back boiler in the grate would provide us with hot water. We were very pleased when my father was able to afford to fit an immersion heater - a great relief in the hot summer days! Regards, Toodles.


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 5 years ago
Posts: 2190
07/01/2026 5:31 pm  

I think we're starting to veer off topic again (probably my fault), but before we haul ourselves back to the subject at hand I'll just mention that I'm starting to be reminded of Monty Python's Four Yorkshiremen sketch


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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cathodeRay
 cathodeRay
(@cathoderay)
Famed Member Moderator
Joined: 5 years ago
Posts: 3099
07/01/2026 7:18 pm  

@majordennisbloodnok — The Two Ronnies Mastermind sketch was in the youtube sidebar, stunningly clever comic writing, but it might also serve as the model for all those answers dodgy installers give when asked questions.


Midea 14kW (for now...) ASHP heating both building and DHW


   
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